MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256bf109c1f20433e5b45a6c88d868d90a76ed7bbb13810047eace8f5c287820dbc
MD56c368d7856e8af7e64ebc9eb7477fd53
File Typeexe
Size978.5 KB
First Seen2026-05-21
File NameContract_Draft.exe
Tagsexe, MassLogger

Malware Family: MassLogger

MassLogger, email tabanlı keylogger'dır.

TypeInfostealer
Programming LanguageC#/.NET
Target PlatformWindows
C2 ProtocolSMTP/FTP
PurposeEmail keylogger
First Seen Year2020

Threat Indicators (IOC)

  • SHA256: bf109c1f20433e5b45a6c88d868d90a76ed7bbb13810047eace8f5c287820dbc
  • MD5: 6c368d7856e8af7e64ebc9eb7477fd53

You can verify all hash values of this sample on VirusTotal.

System Cleanup Guide

  1. Disconnect the system from the network immediately
  2. Yeni bir cihazdan banka hesabı, sosyal medya ve e-posta şifrelerini değiştirin
  3. Move crypto wallets to a new address and abandon the old ones
  4. Start a full scan with up-to-date antivirus
  5. Clear saved browser passwords and enable 2FA
  6. Sign out of all sessions on every affected service

YARA Rule Hints

rule MassLogger_SHA256 {
    meta:
        description = "MassLogger sample: bf109c1f20433e5b"
        threat_level = "medium"
        first_seen = "2026-05-21"
    condition:
        hash.sha256(0, filesize) == "bf109c1f20433e5b45a6c88d868d90a76ed7bbb13810047eace8f5c287820dbc"
}

MassLogger — Malware Profile

MassLogger credential stealer. PT2600000043.js Portekiz fatura lurü. CommonJS obfuscation. dispatch configuration data.

Malware Type
Infostealer
Programming Language
C#/.NET
C2 Protocol
SMTP/FTP
Target Systems
Windows

Capabilities & Behavior

Tarayıcı Kimlik Bilgileri
Çerez Hırsızlığı
Kripto Cüzdan Çalma
Sistem Bilgisi
Ekran Görüntüsü
FTP/SSH İstemci Şifreleri
E-posta İstemcisi Çalma
Veri Sızıntısı

IOC List (2 indicators)

IOC — MassLogger
# SHA256 bf109c1f20433e5b45a6c88d868d90a76ed7bbb13810047eace8f5c287820dbc # MD5 6c368d7856e8af7e64ebc9eb7477fd53
TypeValueNote
sha256 bf109c1f20433e5b45a6c88d868d90a76ed7bbb13810047eace8f5c287820dbc Sample:MassLogger
md5 6c368d7856e8af7e64ebc9eb7477fd53 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi